Is my daughter pregnant?

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I'm getting antsy here so I'll turn to my mylot friends. My daughter ran out of birth control about 2 month ago. She never had them refilled. Silly girl. Anyhow, she says she hasn't had a period since March 21, I think she's wrong, and I think she did have one in March, and I think she had one in April. I actually think she started April 21, maybe she's missing a month somewhere. Well, it's now the 26th of May and she has yet to have another period. She took a pregnancy test, one of the first response tests and it came back positive, but she has taken two more tests and they've came back both negative. I asked her this afternoon if she has any pregnancy symptoms and she said it takes her about an hour in the morning to get up and about where normally it doesn't take her but a few minutes. She says she has to let the nausea and stuff kind of wear down. And she says her upper half is tender and she said something else but don't remember what it was she said. So what do you guys think? Could it be stress? Why would one test come positive and two negative?